The Syrian Foreign Ministry on Monday sent letters to the UN secretary-general and the UN Security Council, in which it condemned the capture of Syria's Afrin by the Turkish Armed Forces as violating the international law and the core principles of the UN Charter.

"The declaration by the Turkish president of control over the Syrian city of Afrin is unacceptable and contradicts the principles of the UN Charter and the international law," the ministry was quoted as saying by the SANA news agency.

The Syrian Foreign Ministry also demanded the immediate withdrawal of the Turkish troops from Afrin.

The Ministry added that the Turkish practices and attacks not only threaten the lives of citizens and the unity of Syrian territory and people, but also prolong the war on Syria as a service to terrorism and its supporters, as they threaten security and peace of the region and the world.

On Sunday, Turkish President Recep Tayyip Erdogan announced that the Turkish forces and the units of the Free Syrian Army had entered Afrin and had established full control over the city.